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Foreign Operations, Geographic Area and Product Segment Information (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |  |
Depreciation and amortization | $ 16,192 | $ 12,892 | $ 10,789
Expenditures for long-lived assets | 24,994 | 60,364 | 10,724
LED And Solar |  |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |  |
Depreciation and amortization | 12,020 | 8,320 | 5,506
Expenditures for long-lived assets | 20,279 | 56,141 | 8,086
Data Storage |  |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |  |
Depreciation and amortization | 3,008 | 3,245 | 3,581
Expenditures for long-lived assets | 3,341 | 2,703 | 572
Unallocated Corporate Amount |  |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |  |
Depreciation and amortization | 1,164 | 1,327 | 1,702
Expenditures for long-lived assets | $ 1,374 | $ 1,520 | $ 2,066

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